Strain effect in PbTiO3/PbZr0.2Ti0.8O3 superlattices: From polydomain to monodomain structures
Strain effect in PbTiO3/PbZr0.2Ti0.8O3 superlattices: From polydomain to monodomain structures
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PbTiO3/PbZr0.2Ti0.8O3 超晶格中的应变效应：从多域到单域结构
DOI：
10.1063/1.4767329
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发表时间：
2012
影响因子：
3.2
通讯作者：
N. Lemée
中科院分区：
文献类型：
--
作者：
C. Hubault;C. Davoisne;A. Boulle;L. Dupont;V. Demange;A. Perrin;B. Gautier;J. Holc;M. Kosec;M. Karkut;N. Lemée
采用脉冲激光沉积技术在SrTiO3和srruo3包覆的SrTiO3衬底上生长出由PbTiO3和PbZr0.2Ti0.8O3交替层组成的铁电对称超晶格。利用x射线衍射（θ−2θ衍射扫描、摇摆曲线和倒易空间映射）、高分辨率透射电子显微镜和压电扫描显微镜对波长Λ为20 ~ 200 A的超晶格进行了分析。对于大周期的超晶格，应变通过a/c多畴结构的形成而得到缓解，该结构在整个薄膜中传播。我们研究了波长对样品的a域体积分数、晶格参数、面内应变exx和嵌合性的影响。我们发现，随着波长的减小，a域体积分数的减小以及拉伸面内应变的减小和嵌合性的降低。检测到局部铁电响应的改善。在临界波以下…
Ferroelectric symmetric superlattices consisting of alternating layers of PbTiO3 and PbZr0.2Ti0.8O3, were grown by pulsed laser deposition on SrTiO3 and SrRuO3-coated SrTiO3 substrates. The superlattices, with wavelengths Λ ranging from 20 A to 200 A, were analyzed using x-ray diffraction (θ−2θ diffraction scans, rocking curves, and reciprocal space mapping), high resolution transmission electron microscopy, and piezoforce scanning microscopy. For large-period superlattices, the strain is relieved by the formation of an a/c polydomain structure which propagates through the whole film. We investigate the influence of the wavelength on the a-domain volume fraction, the lattice parameters, the in-plane strain exx, and the mosaicity of the samples. We show that with decreasing the wavelength, a reduction of the a-domain volume fraction is observed as well as a reduced tensile in-plane strain and a lower mosaicity. A concomitant improvement of the local ferroelectric response is detected. Below a critical wave...